z~2.56三叶草QSO中的PAH辐射和恒星形成
PAH emission and star formation in the host of the z~2.56 Cloverleaf QSO
摘要:
本文报道了在一个高红移类星体(H1413+117,z~2.56)的Spitzer-IRS光谱中首次探测到6.2微米和7.7微米的红外“PAH”发射特征。PAH特征和静止帧远红外辐射的比率与低光度恒星形成的超亮红外星系和本地PG类星体相同,支持立体式巨大的远红外光度(5.4E12 Lsun,经透镜校正)的主要星暴性质。类星体活动的立体式周期(Lbol ~ 7 E13 Lsun)与一个强烈的(恒星形成速率~1000 Msun/yr)和短暂的(气体耗尽时间~ 3E 7 yr)恒星形成事件相一致。
英文摘要:
We report the first detection of the 6.2micron and 7.7micron infrared `PAH' emission features in the spectrum of a high redshift QSO, from the Spitzer-IRS spectrum of the Cloverleaf lensed QSO (H1413+117, z~2.56). The ratio of PAH features and rest frame far-infrared emission is the same as in lower luminosity star forming ultraluminous infrared galaxies and in local PG QSOs, supporting a predominantly starburst nature of the Cloverleaf's huge far-infrared luminosity (5.4E12 Lsun, corrected for lensing). The Cloverleaf's period of dominant QSO activity (Lbol ~ 7E13 Lsun) is coincident with an intense (star formation rate ~1000 Msun/yr) and short (gas exhaustion time ~3E7yr) star forming event.
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